Question: When did Muslim armies invade the country where Al-Mu'tamid's successor was a citizen and the country where Rankus is located?
Context: Document 1: Rankous: Rankous or Rankus () is a Syrian town and summer resort in the province's Damascus countryside (Rif Dimashq) located in Mount Qalamoun (anti-Lebanon) in Syria, 45 km from Damascus, with a total area of 22.277 km ², extends between 1650 and 2150 m. The climate of the town is cool in summer and cold in winter. The rate of rain and snow usually varies between 350 and 650 mm. The mountains surrounding the town are covered with snow in winter. According to the Syria Central Bureau of Statistics (CBS), Rankous had a population of 7,717 in the 2004 census.
Document 2: Mu'nis al-Fahl: Under al-Mu'tadid he served as commander of the caliph's personal guard and led various expeditions against Bedouins and other restive elements in Iraq, while al-Muqtafi dispatched him in 906 against the Qarmatians. After al-Muqtafi's death, he played a decisive role in the suppression of the palace coup that briefly deposed al-Muqtadir in favour of Abdallah ibn al-Mu'tazz. He was then named treasurer ("khazin") and chief of security ("sahib al-shurta") to the Caliph. He died in 914.
Document 3: Muslim conquest of the Levant: The Muslim conquest of the Levant (Arabic: اَلْـفَـتْـحُ الْإٍسْـلَامِيُّ لِـلـشَّـامِ ‎, Al - Faṫṫḥul - Islāmiyyuash - Shām) or Arab conquest of the Levant (Arabic: اَلْـفَـتْـحُ الْـعَـرَبِيُّ لِـلـشَّـامِ ‎, Al - Faṫṫḥul - ʿArabiyyu Lish - Shām) occurred in the first half of the 7th century, and refers to the conquest of the region known as the Levant or Shaam (Arabic: شَـام ‎, 'Syria'), later to become the Islamic Province of Bilad al - Sham, as part of the Islamic conquests. Arab Muslim forces had appeared on the southern borders even before the death of prophet Muhammad in 632, resulting in the Battle of Mu'tah in 629, but the real invasion began in 634 under his successors, the Rashidun Caliphs Abu Bakr and Umar ibn Khattab, with Khalid ibn al - Walid as their most important military leader.
Document 4: Al-Mu'tadid: Al-Mu'tadid was the son of al-Muwaffaq, who was the regent and effective ruler of the Abbasid state during the reign of his brother, Caliph al-Mu'tamid. As a prince, the future al-Mu'tadid served under his father during various military campaigns, most notably in the suppression of the Zanj Rebellion, in which he played a major role. When al-Muwaffaq died in June 891 al-Mu'tadid succeeded him as regent. He quickly sidelined his cousin and heir-apparent al-Mufawwad, and when al-Mu'tamid died in October 892, he succeeded to the throne. Like his father, al-Mu'tadid's power depended on his close relations with the army. These were first forged during the campaigns against the Zanj and were reinforced in later expeditions which the Caliph led in person: al-Mu'tadid would prove to be the most militarily active of all Abbasid caliphs. Through his energy and ability, he succeeded in restoring to the Abbasid state some of the power and provinces it had lost during the turmoil of the previous decades.
Answer: in 634
Reasoning steps: Al-Mu'tamid >> followed by Answer: Al-Mu'tadid
Al-Mu'tadid >> country of citizenship Answer: Iraq
Rankus >> country Answer: Syria
when did muslim armies invade Syria and #2 Answer: in 634